They are right/left/middle buttons for the mouse. The keyboard is a 'Tex Shinobi' https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=6169 https:

They are right/left/middle buttons for the mouse. The keyboard is a 'Tex Shinobi' https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=6169 https://mechanicalkeyboards.com/shop/index.php?l=product_det...